Agilent Technologies 6571A, Service Manual

Page: 13 / 161

Verification 13
Programming the Tests
General Considerations
Procedures are given for programming these tests either from the front panel keypad or from a GPIB controller for a GPIB
controller for 667xA system supplies. The procedures assume you know how to use the front panel keypad or how to
program over the GPIB (see the Power Supply Operating Manual for more information). When using computer-controlled
tests, you may have to consider the relatively slow (compared to computer and system voltmeters) settling times and slew
rates of the power supply. Suitable
WAIT
statements can be inserted into the test program to give the power supply time to
respond to the test commands.
Hazardous voltages may be present at the power supply output during these tests. They should be
performed only by qualified electronics personnel.
Programming Parameters
Table 2-2 lists the programming voltage and current values for each model. You can enter these values either from the front
panel or from a controller over the GPIB (for system power supplies).
Table 2-2. Programming Voltage and Current Values
Agilent Model Full Scale Max. Prog. Full Scale Max. Prog. Max. Prog. -CC
Voltage Voltage Current Current Overvoltage Current
Agilent 6571A, 6671A 8V 8.190V 220A 225.23A 10V 10A
Agilent 6572A, 6672A 20V 20.475V 100A 102.37A 24V 10A
Agilent 6573A, 6673A 35V 35.831V 60A 61.43A 42V 5A
Agilent 6574A, 6674A 60V 61.425V 35A 35.83A 72V 4A
Agilent 6575A, 6675A 120V 122.85V 18A 18.43A 144V 2.5A
General Measurement Techniques
Figure 2-1 shows the setup for most tests. Measure the dc output voltage directly at the sense ( +S and -S ) terminals.
Connect these terminals for remote sensing (to the +LS and -LS terminals). Be certain to use load leads of sufficient wire
gauge to carry the output current (see Chapter 4 of the Power Supply Operating Manual). To avoid noise pickup, use
coaxial cable or shielded pairs for the test leads. If you use more than one meter or a meter and an oscilloscope, connect
separate leads for each instrument to avoid mutual-coupling effects.
Performance Test Record Sheets
When performing the tests in this chapter, refer to the Performance Test Record sheets supplied at the end of this chapter.
Table 2-6 is for recording common information, such as, the test equipment used and the environmental conditions. Tables
2-7 through 2-11 are dedicated to specific models and contain the acceptable test values and ranges. A place is provided to
record the results of the test.